95 lines
2.9 KiB
Java
95 lines
2.9 KiB
Java
/*
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* Copyright (c) 2021, Red Hat Inc. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package org.openjdk.bench.java.lang;
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import org.openjdk.jmh.annotations.Benchmark;
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import org.openjdk.jmh.annotations.BenchmarkMode;
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import org.openjdk.jmh.annotations.Fork;
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import org.openjdk.jmh.annotations.Level;
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import org.openjdk.jmh.annotations.Measurement;
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import org.openjdk.jmh.annotations.Mode;
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import org.openjdk.jmh.annotations.OutputTimeUnit;
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import org.openjdk.jmh.annotations.Param;
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import org.openjdk.jmh.annotations.Scope;
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import org.openjdk.jmh.annotations.Setup;
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import org.openjdk.jmh.annotations.State;
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import org.openjdk.jmh.annotations.Warmup;
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import java.util.concurrent.TimeUnit;
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import java.util.concurrent.atomic.AtomicInteger;
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@BenchmarkMode(Mode.AverageTime)
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@OutputTimeUnit(TimeUnit.MILLISECONDS)
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@State(Scope.Benchmark)
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@Warmup(iterations = 5, time = 1)
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@Measurement(iterations = 5, time = 1)
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@Fork(value = 3)
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public class ThreadOnSpinWaitSharedCounter {
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@Param({"1000000"})
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public int maxNum;
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@Param({"4"})
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public int threadCount;
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AtomicInteger theCounter;
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Thread threads[];
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void work() {
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for (;;) {
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int prev = theCounter.get();
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if (prev >= maxNum) {
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break;
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}
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if (theCounter.compareAndExchange(prev, prev + 1) != prev) {
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Thread.onSpinWait();
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}
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}
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}
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@Setup(Level.Trial)
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public void foo() {
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theCounter = new AtomicInteger();
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}
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@Setup(Level.Invocation)
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public void setup() {
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theCounter.set(0);
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threads = new Thread[threadCount];
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for (int i = 0; i < threads.length; i++) {
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threads[i] = new Thread(this::work);
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}
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}
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@Benchmark
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public void trial() throws Exception {
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for (int i = 0; i < threads.length; i++) {
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threads[i].start();
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}
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for (int i = 0; i < threads.length; i++) {
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threads[i].join();
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}
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}
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}
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